Add prices for products from the Product form view > Purchase tab.
To configure vendor prices for each product available for purchasing:
Purchase app > Products > Products
See the list of products filtered by “Can be purchased” by default:
Choose or create a product. For purchase product next fields are important:
Choose the Vendor from the list.
Insert quantity of the units that will be ordered.
Units should be same as at the General Information tab in the Product form view: Purchase UoM
Input the price for the pointed quantity (we recommend to put the quantity of 1 unit and the price for 1 unit).
Even if we did not enter the Vendor here in the Purchase tab of the product, as soon as we create PO which includes this product - Vendor will appear here.
And also it will appear at the Purchase App > Configuration > Vendor Pricelist.
But still better to prepare Vendor prices in the Product card if they are known in advance.